Apparatus for amusement and instruction in aviation



Sept. 28, 1937. R. P. CORTES 2,094,397

APPARATUS FOR AMUSEMENT AND INSTfiUCTiON IN AVIATION Filed Dec. 10, 1954 e Shets-Sheet 1 INVENTOR RAFAEL Pouc: Comes ATTO R N EY R. P. CORTES Sept 28,1937.

APPARATUS FOR AMUSEMENT AND INSTRUCTION IN AVIATION Filed Dec. 10, 1954 s SheetsSheet 2 INVENTOR RAFAEL Pouca CORTES wru ATTCRNEY Sept. 28, 1937. R. P. CORTES APPARATUS FOR AMUSEMENT A ND INSTRUCTION IN AVIATION Filed Dec. 10.; 1934 6 Sheets-Sheet 3 INVENTOR RAFAEL Pouca Con-res BY 2 E ATTORNEY Sept. 28, 1937. CORTES 2,094,397

APPARATUS FOR AMUSEMENT AND INSTRUCTION IN AVIATION Filed Dec. 10, 1954 6 Sheets-Sheet 4 INVENTOR RAFAEL PONCE. Comzs ATTORNEY R. P. CORTES Sept. 23, 1937.

APPARATUS FOR AMUSEMENT AND INSTRUCTION IN AVIATION 6 She ets-Sheet 5 Filed Dec. 10, 1934 INVENTOR v RAFAu. Poncr. Comes ATTORNEY Sept. 28, 1937. R. P. CORTES 2,994,397

APPARATUS FOR AMUSEMENT AND INSTRUCTION IN AVIATION Fi led Dec. 10, 1934 e Sheets-Sheet s INVENTOR RAFAEL one; Comes 'ATTORNEY Patented Sept. 28, 1937 UNITED STATES PATENT OFFICE APPARATUS FOR AMUSEMENT AND INSTRUCTION IN AVIATION Rafael Ponce Cortes, Mexico, D. F., Mexico Application December 10, 1934, Serial No. 756,908 In Mexico December 22,1933

6 Claims.

Fig. 2 is an elevational view of the device shown.

.in Fig. 1 with only two of its suspension arms.

Fig. 3 is an enlarged sectional view of a portion of Fig. 2.

Fig. 4 is an elevational view of one of the arms per se.

Fig. 5 is an enlarged plan view of Fig. 3.

Fig. 6 is a sectional view taken on the line 6--6 of Fi 5.

Fig. 7 is an enlarged sectional view of a portion of Fig. 3.

Fig. 8 is a sectional of Fig. 7. v ,7 r 20 Fig. 9 is a sectional view of an airplane usedin conjunction with this invention.

Fig. 10 is an enlarged detail view of -a portion of Fig. 9.

Fig. 11 is an enlarged detail view, partly in section, of a portion of Fig. 10. g The apparatus for amusement and instruction in aviation, according to this invention, comprises, a circular gyrating tower which by means of ballbearings rests on the axes of several wheels, which in their turn, rest and run over a rail in a circle, fixed to the ground with radial ties that go up to the center of the said circle, being held at this point by means of an iron plate, which, at ,the same time that it joins them, contains a bearing into which penetrates a hollow vertical axis fixed to the center of the base of the tower, and which view taken on the line 8--8 has as an object that the wheels of the said tower should not derail. At the upper part of the tower there is a tank 6 of special shape with a certain number of rackand spring valves I, placed at the bottom of same, and these valves have an outlet tube alignable with the mouth of each of the counter-balance cylinders 4. At the lower part of the tower and resting on the floor of same, there are two tanks 8, which are two, only to distribute the weight more evenly over the floor of the tower, and these tanks are filled up with water by means of a hose, before the apparatus is put in operation, and they also receive the water that flows through pipe 31, which is inside the column 9; these tanks communicate one with the other and are connected to a centrifugal pump moved by a motor III, which has as an object to lift the water from the lower reservoirs 8, to the upper 01. 5, Another motor 39 moves, by means of a belt, another pulley, which is mounted on the shaft of the main transmission 1 l, which rests on bearings and has secured to it, a conical gear, by means of which it transmits power to another conical gear fixed to a second shaft, which also rests on bearings and is placed transversally to the first one, and the second shaft has also fixed to it, the small wheel of a chain gear, which, by means of a chain,

transmits power to the large wheel of the chain gear, secured to a third shaft, which is also supported by bearings and placed below the floor of the tower, parallel to the second shaft and under it. This last shaft has near its bearings, at each end, an endless reversible screw or worm, which gears with a gear wheel coupled to each of two of the lower wheels l3, on which the tower is supported, thus receiving power to drive the whole apparatus, at the start only, as the combined power of the motors of the planes, is sufficient to givean ample impulse by means of the propellers. In this case, the drive is as described, but it can be of any kind suitable; the same motor (in due time) acts upon the irreversible endless screw which is connected with the cog-wheel M, which is coupled to the drum of the winch I5.

The tower before described has at its center an iron column 9, which serves to guide the two iron disks I1 and 40 or lower disk, and also contains the pipe 3] which conducts the water that comes out of the counter-balance cylinders.

Disk I! has in its center a box in the form of a ring where converge the outlets of some radial 'canals, and which serve to conduct the water that may come out from any of the counter-balances; this water is collected in the central box and flows by the conduit 3| to fall in the pipe 31 of column 9; the said disk I1 has oval perforations through which pass freely the lower end of the rack-bars of valves 1.

Under disk I I there is another disk 40 supported by four connecting rods which articulate at the end of four levers 32, these levers turn on their longitudinal half and rest by means of a support upon the upper disk ll; at the other end of the said levers, four cables are fixed, which meet at a certain distance, having as an object, that when they are pulled by means of lever 38, these cables will join together both disks l1 and 40.

The said disks l1 and 4|] are suspended by means of two cables that pass through the groove of the pulleys l6, joining themselves later at an equalizing bar, which, in its longitudinal half has a perforation, where another cable is fixed, and

the pulley from the disk 34.

movement to the winch, the lever Y must be 'movedto'the left;

39; the clutch and the shaft have feather keys;

which allow the clutch to run along the shaft, to be coupled with the other'part of the clutch that is fixed on the transmission, which is gearing with two of the lower wheels l3.

The lever Y is supported at its lower end by a universal joint that allows it to-be moved from right to left, and forward and backward, and at a certain height it is shaped in the'form ofa" ring, there, a ring is lodged, which at that place issecured to the lever by'rneans of two bolts, placed diametrically and horizontally opposite; a and in itsturn, this ring fits into the slot of the projecting hub of a pulley that goes inside the ring. This pulley, Whose periphery is covered with leather, runs lengthwise on a shaft, which serves it as an axis and makes it to turn around with its rotating motion, by means of a feather key fitting a longitudinal slot in the said shaft, which, in its turn, it gyrates supported by two jbearings that can be moved-a little, transversally, in relation to the shaft they support, because of a slot there is in them; This shaft has at an end; a univ'ersal joint that connects it to the section of anothershaft fixed to the frame of the winch by means of two'bearingshaving between the jsaid bearings, an endless irreversiblescrew or worm of a single entrance,-which gears with a spur wheel fixed by a feather key to the axis of the drum of the winch. At the same height and forming a-right angle with-the shaft on which the leather coveredpulleyruns, the shaft of the *main transmission I I, is placed, which, has at an end, a disk or plate 34, secured to it by. a feather key, therefore, it rotates with the main transmission. As the lever Y is placed vertically, the

"leather covered pulley isplaced at the center of the said-disk 34, therefore, in order to make the worm turn to the right, the lever Y is moved to 50 the right, pushing it simultaneously against the disk, with the result that the pulley comes in contact with the surface of the disk 34, which draws the pulley in its rotating motion, due to friction. As it may be understood all that is needed to stop the endless screw, is to separate To impress a reverse Fig. 4 represents one of the arms or spokes which rest on the upper part of the tower C by means of a steel axle I, having an end that projects inside of the tower, two'pulleys- 2 grooved in their periphery, cables 3 run over the pulleys 2' and are connected at one, extreme to the floor of the tower, having suspended at their other'extreme a cylindrical tank 4, which will be filled with water 'to serve as counterbalance to the aeroplane that ;.is suspended at the other end of the said arm D, 'forming thus an intermotion lever.

Valves], Figs. 3, '7 and 8, consist of a stopcock but with'the' difference that this one, has on its head the section of a cog-wheel, which gears with a rack-bar which bar has a compression spring that compels it to be always at the lowestpoint of its course, causing that the va v be alway -"trol cables. control has an end tied below the pivot to the control stick, and the other cable 2| is tied versally.

closed, and it opens, only when pressure is applied upwards. By the rising ballast tank 4 on the rack-bar the spring is pressed together, causing the gear to gyrate, drawing the center of the valve up we fourth of its turn, to allow the water to a/SS. p Fig. 9 illustrates one of the aeroplanes, suspended at the outer'extreme of each arm D, by means of a universal joint 5, Fig. 5, a little above its center of gravity. Fig. 10 represents in detail the automatic control'of the aeroplanes.

The aeroplanes have their movable rudders and are controlled the same way as or similar to those of'the most widely used airplanes in modern warfare: the depth helm and the ailerons being moved by a single control; being normally fixed'since this helm is fixed in the direction of which it can rotate. Near both of its endsit has two-parallel pulley blocks secured to it, and at the 'end, below" the lower blocks, it "has a hole where a spring, fastened farther back in the airship, is hooked; and it pulls its lower-end towards the rear of the airplane. The lever has at its middle part, two iron orwooden guides. And as a part'of the device, there is also inside the fuselage, Fig. 10, a panel 29, which is placed "more to' the front part of the plane than the lever,

having its upper border at about the same height as the upper'part of the lever-20, and the said panel 29 has also two pulley blocks, and a little higher than the blocks, corresponding to each one of them, it hasalso an iron or'wooden guide. 'To complete the device l8, there are a control stick, two cables 2| of the hand control, two cables wand 24 of the automatic control, and also two cables 22 and 4 I, auxiliaries to the automatic con- One of the cables 2| of the hand above the pivot, thenboth free ends of these cables, guided by blocks, run to the rear of the plane, up to lever 20, which they reach trans- There, they pass under and slide against'the'lower blocks'of the said lever 20 and through the guides which this lever has at its --middle part.

From there they pass over and slide on the upper blocks of lever 20, and there they issue, also in a transversal position to the lever, towards the rear of the airplane, where the free 'end ofthe cable that is tied to the control stick, below its pivot, is tied to the upper end of v the elevator horn, and the end of the-other, is tied to the lower end of the elevator horn, thus crossmg each other. Cable [9 'of the automatic control, has a calculated length, so when the airship suspended at'theend' of the arm, is about at' the limit of its downward course, which is about "a meter from the ground, it becomes taut. This fcableis tied'b-y one of its ends, at a'p'roper height, correspondingto its length,'to one of the columns over and slides on the upper block of panel 29,

from where it runs to the lower end of lever 20, where it is secured at the hole which the lever has there. Cable 24 of the automatic control, is tied by one end, at a certain height, also corresponding to its length, to the column on which the arm rests, and its length is also determined like that of cable l9, so when the airship has reached the limit of its upward course, it becomes taut; its other end is passed like that of cable l9, through the pipe inside thearm, follows the same course in an identical way, and when it reaches the panel 29, it is passed over and slides on the lower block of the panel, to have its other end tied to the same hole at the lower end of lever 20, where cable l9 was tied. Thus, both cables pull toward the front of the airship, in a direction opposite to the pull of the spring that is also hooked at the same hole of the lever where the cables [9 and 24 are tied. Cable 22, auxiliary to cable I9 of the automatic control, is secured by a grapple to the said cable l9, near the panel 29, and its other end, passing first through the upper guide of the said panel and through one of the upper ones of the lever 29, is also secured by a grapple, to cable 2| of the hand control, whose end is tie-d to the upper end of the elevator horn. This device l8, operates in such a way, that when the control stick of the hand control is pulled backward, the airship suspended at the end of the arm, will go up in proportion to the motion given to the control stick, as it pulls the cable 2] whose end is tied to the upper end of the elevator horn and raises the elevators, and then the airship goes up, because of its reaction, caused by the effect of the wind on the elevators, just as it is done in all aeroplanes. When the control stick is pushed forward, the airship will go down in proportion to the movement given to the control stick, as it then pulls cable 2| of the hand control, which is tied to the lower end of the elevator horn, and this lowers the elevators, and the aeroplane reacts, going down. As the control stick operates as it does in all aeroplanes, if it is moved to the right, the airship will bank to that side, and if to the left, it will bank then to the left. When the airplane is near the limit of the upper course allowed to it, cable 24 of the automatic control becomes taut, because its length has been determined for the purpose, and it pulls the lower end of lever 20, which, loosens the cables of the hand control just at the section that passes through the lever, and simultaneously, cable 24 as it becomes taut, pulls the auxiliary cable 4|, and this one, in its turn pulls cable 2! of the hand control, at the point where they are joined by the grapple, and beyond that point where cable 2| has been loosened, and as cable 2| is tied to the lower end of the elevator horn, it lowers the elevators, and the airship goes down, because it reacts due to theeifect of the wind on the elevators, just as it acts in all aeroplanes. When the airship has come to the limit of distance from the ground, determined for it, which is about a meter from the ground, then, cable !9 of the automatic control and its auxiliary one 22, arranged as cables 24 and M are, pulls the cable 2! that has its end tied to the upper end of the elevator horn, which causes the elevators to be raised, and makes the aeroplane to go up for the reasons state-d.

The said aeroplanes have on their forward part and within the ogive which forms the prow of the fuselage a lining of threeply wood forming a megaphone, inside of which, passes the transmission shaft which is coupled directly to the electric motor 25 of the propeller that propels the aeroplane; on this same shaft a toothed wheel 26 is fixed, which on turning engages the lever 21 and produces a vibratory movement rattles, but with the difference that as this lever has its point of rest and of gyration on its longitudinal half and is constantly pushed-by a spring 30 against the triangular teeth of the wheel 26, the other. free end hits at each jump from one tooth to the other, against the metallic disk 28 that is at the bottom of the megaphone, producing a noise that on being amplified by the megaphone resembles the noise produced by the explosions of gasoline motors.

Functioning of the apparatus in general Once the motor 39 is started and the counter-balance tanks are filled, lever Y is pushed making the winch iii to roll up the cable 35, therefore making disks I? and Ml go up, which puts in operation the upper disk I? and the lower one ill, for two purposes: first, to lower all airplanes to about a meter from the ground, and second, to accomplish the balancing of the counterbalance tanks that have excess of water, before a flight is started, and they are put in operation, as stated, by means of winch l5 and cable 35, which, raise all the counterbalances by pushing them up, when at different heights they come in contact with the disk, by a piece that similar to that of the tongues of from the bottom of each tank, projects down- I wardly, for the purpose. When the disks have been raised to their proper and predetermined height, in that position they willhave lowered all the airships to about a meter from the ground,

and then, the persons that are going to fly, can board the planes, aided by asmall portable stair, and also with the disks in that position,the outlet pipe 3i under disk ll, will fit into the entrance of pipe 31, which is inside the central column 9, and thus, the water that the counterbalance tanks may have in excess and which they discharge into the canals of disk ll,

48, to be raised to join the upper one H, with the result that then disk til, pushes up the automatic valves i under each completely filled tank, which will allow the water to flow till the balancing with the airplane is accomplished.

In the mean time all the counter-balance tanks that lack weight, have gone up by themselves to push their corresponding valve under the upper. tank 5, and take in water till they are balanced. The lever 38, which joins disks ill and all, by pulling cables 35, can be any kind'ofdevice for the purpose, but in this case it is a lever of the second kind, consisting in a bar which rests on, and is fixed at one end to, to

the floor of the tower, and at about one third the distance from the end that is fixed on the floor, it has secured to it, the ends of the four cables 36, which are to be pulled by it, the other end of the lever remaining altogether free, and when the disks are raised to their proper height, the lever in question 38, remains suspended by the four cables 36, with its free end somewhat raised from the floor of the tower, and by pushing down that free end with the hand or the foot, it will pull the' cables 36, and this will make 'disk 40 to go up to' join disk ill; now, if the weight of the persons that have boarded the plane should be greater than that ofthe liquid contained in the tank 4, the aeroplane will tend to go farther down and therefore will lift the corresponding counter-balance tank higher up, making it push therack-bar of valve 1 in the upper tank and on being opened it Will let flow into the counter-balance tank the necessary water to equalize the weight, shutting itself then by the pressure of the spring. If on the contrary the liquid contained in the counterbalance has a greater weight than that of the passengers, this tank will tend to go farther down and the rack-bar of its valve will hit on the disk 48 therefore'opening the said valve, producing an outlet for the water of thesaid tank, till the weight is balanced just as before; the excess of water discharged into the canals of disk I! flowing through the pipe 31 of column 9, which pipe as it has been said before is' connected to the lower tanks 8. This balancing is automatic and is accomplished in a very short time before the apparatus is set to gyrate. Now the lever Y is pulled making the winch [5 to unroll the cable 35 which allows therefore disks l7 and 40 to go down by their own Weight till they touch the floor of the tower, but before they get there, all the electric motors that drive the propellers of the aeroplanes are put to work, but with a moderate speed, making themto take all their speed gradually to give the impression of the running of a real aviation motor; when all the motors are running the brake 33 will be loosened by means of lever O, and pushing the lever Z, it will clutch the transmission that moves two of the lower wheels l3 making the tower gyrate till the aeroplanes take all their speed, which, impelled also at the same time by their propellers will attain soon their maximum velocity, unclutching then with lever Z so that the tower may keep gyrating only by the impulse of the propellers of the aeroplanes, which will go up by themselves on account of the centrifugal force, only up to their mid upper course; now if the person acting as pilot takes the control and pulls it toward himself, the aeroplane will go up with a speed in proportion to how much he has moved the control; if on the contrary he pushes the control forward, the aeroplane will descend with a velocity in proportion to the amplitude of the Fig. 10, the cable 59 of the automatic control becomes tense and pulls lever 20 loosening the cables of the hand control 2!, cable 22 to move downward the elevator 23 the aeroplane recovering therefore its horizontal flight. When the aeroplanes descend to almost allowing the their lowest limit obeying the hand control 2|,

the cable 24 tightens acting on lever 20, but in this case the cable 4| is the one that makes go up the elevator, therefore, making the aeroplane recover its horizontal position of flight, no matter what the position of the hand control may be inthe hand of the one that 'acts as pilot, on account of its automatic actionu When the time fixed for the flight comes to an end, the electric current that feeds the aeroplane motors is cut out, and by means of lever O the'tower is braked little by little; simultaneously and by means :of lever Y, the'winch Will be made to work, which, on winding the cable, raises disks l1 and 40 as has been explained, causing the aeroplanes to come down till they come to about a meter from the ground regardless of the position in which they were when the current was cut out. When new persons board the airships, all the parts of the apparatus will be operated again as per description in the first paragraph of the description entitled Functioning of the apparatus in general.

As it may be understood by the previous description, the public may operate these aeroplanes easily and at the same time that it is amused, it receives, without dangeninstruction in aviation, as for additional security, each passenger will be secured to his seat by a strong leather'strap similar to that which was used before in aviation and was generally called scapulary.

I claim:

1. In an apparatusfor amusement and instruction in aviation, a circular track mounted on' the ground, a revolving base having wheels on the underside adapted to engage said track to permitsaid base to rotate, a tower mounted the outer extremities of said arms, pulleys mounted on the inner extremities of said arms, cables connected at one end to said base and extending over said pulleys, and ballast tanks mounted on the other end of said cables and adapted to control the pivoting of said arms.

2. In an apparatus for amusement and instruction in aviation, a circular track mounted on the ground, a revolving base having wheels on the underside adapted to engage said track to permit said base to rotate, a tower mounted on the said base and comprising a central column and several columns mounted in spaced relation on said base, arms pivotally mounted on said several columns and having a greater portion extending from said tower, airplanes mounted on the outer extremities of said arms, pulleys mounted on the inner extremities of said arms, cables connected at one end to said base and extending over saidipulleys, and iballast tanks mounted on the other end of said cables and adapted to control the pivoting of said arms, and means for increasing the weight of said ballast tanks so that it will correspond with the combined weight of said airplane and the person in said airplane, comprising a'lower' reservoir full of water mounted on said base, an upper reservoir mounted in the top of said tower, a pipe line connecting said reservoirs, a centrifugal pump mounted on said base and in conjunction with said pipe line and adapted to pump said 'water from said lower reservoir to said upper reservoir, several spring valves mounted on the under side of said upper reservoir, an outlet tube mounted on said valves, an opening in said ballast tanks adapted to align with said outlet tubes when said ballast tanks abut against said valves and opening them allowing water to fiow'from said upper reservoir into said ballast tanks.

3. In an apparatus for amusement and instruction in aviation, a circular track mounted on the ground, a revolving base having wheels on the underside adapted to engage said track to permit said base to rotate, a tower mounted on the said base and comprising a central column and several columns mounted in spaced relation on said base, arms pivotally mounted on said several columns and having a greater portion extending from said tower, airplanes mounted on the outer extremities of said arms, pulleys mounted on the inner extremities of said arms, cables connected at one end to said base and extending over said pulleys, ballast tanks mounted on the other end of said cables and adapted to control the pivoting of said arms, a spring valve mounted on the underside of said ballast tank, and a means for raising said ballast tanks to bring said airplanes to the ground comprising a motor mounted on said base, a winch mounted on said base, a shaft connecting said motor and said winch, pulleys mounted on said tower, a raising plate vertically slidably mounted on said central column and openings in said plate through which said spring valve may extend, and a means for causing said shaft to align with said motor to energize said Winch to raise said ballast tanks and bring said airplanes to the ground.

4. In an apparatus for amusement and instruction in aviation, a circular track mounted on the ground, a revolving base having wheels on the underside adapted to engage said track to permit said base to rotate, a tower'mounted on the said base and comprising a central column and several columns mounted in spaced relation on said base, arms pivotally mounted on said several columns and having a greater portion extending from said tower, airplanes mounted on the outer extremities of said arms, pulleys mounted on the inner extremities of said arms, cables connected at one end to said base and extending over saidpulleys, ballast tanks mounted on the other end of said cables and adapted to control the pivoting of said arms, a spring valve mounted on the underside of said ballast tank, and a means for raising said ballast tanks to bring said airplanes to the ground comprising a motor mounted on said base, a winch mounted on said base, a shaft connecting said motor and said winch, pulleys mounted on said tow-er, a raising plate vertically slidably mounted on said central column and openings in said plate through which said spring valve may extend, and

a means for causing said shaft to align with said motor to energize said winch to raise said ballast tanks and bring said airplanes to the ground, a'

struction in aviation, a circular track mounted on the ground, a revolving base having wheels on the underside adapted to engage said track to permit said base to rotate, a tower mounted on the said base and comprising a central column and several columns mounted in spaced relation on said base, arms pivotally mounted on said several columns and having a greater portion extending from said tower, airplanes mounted on the outer extremities of said arms, pulleys mounted on the inner extremities of said arms, cables connected at one end to said base and extending over said pulleys, ballast tanks mounted on the other end of said cables and adapted to control the pivoting of said arms, a spring valve mounted on the underside of said ballast tank, and a means for raising said ballast tanks to bring said airplanes to the ground comprising a motor mounted on said base, a winch mounted on said base, a shaft connecting said motor and said winch, pulleys mounted on said tower, a raising plate vertically slidably mounted on said central column and openings in said plate through which said spring valve may extend, and a means for causing saidshaft to align with said motor to energize said winch to raise said ballast tanks and bring said airplanes to the ground, a means for decreasing the weight of said ballast tanks so that it will correspond with the combined weight of said airplane and the person in said airplane, comprising an outlet pipe in said central column and connected to said lower reservoir, canals radiating in spaced relation from the center of said raising plate and formed with openings on the inner end thereof, a box in the form of a ring mounted underneath said raising plate and just below said openings, a connecting pipe mounted on said box and adapted to connect said box and said outlet pipe, a pressure plate suspended below said raising plate, and a means for raising said pressure plate to open said spring valve to allow the water to flow from said ballast tanks in order to equalize the weight of said ballast tanks and said airplane,'said latter mentioned means comprising a vertical rod mounted on said raising plate, a lever pivotally mounted intermediate of its end on said vertical rod, a connecting rod mounted on the outer end of said lever and connecting said lever and said pressure plate, cables mounted on the inner end of said lever, a pressure lever mounted on the floor and having the other end of the cables connected thereto in order to pivot said lever and pull up said pressure plate to abut against said valves to open them and allow the water to flow.

6. In an apparatus for amusement and instruction in aviation, a circular track mounted on the ground, a revolving base having wheels on the underside adapted to engage said track to permit said base to rotate, a tower mounted on the said base and comprising a central column and several columns mounted in spaced relation on said base, arms pivotally mounted on said several columns and having a greater portion extending from said tower, airplanes mounted on the outer extremities of said arms, pulleys mountconnected at one end to said base'and extending over said pulleys, ballast tanks mounted on the ed on the inner extremities of said arms, cables with said wheels, a shaft supported below said said gear to transmit the energy from said motor to said wheels to make the said base rotate.

RAFAEL PONCE CORTES. 

